二重循环
import java.util.Scanner;public class Demo01 {public static void main(String[] args) {Scanner scanner = new Scanner(System.in);for (int i=1; i<=3; i++) { System.out.println("请输入第" + i + "班级的成绩");int sum = 0; for (int j=1; j<=4; j++) { System.out.print("第" + j + "个学生的成绩:");sum += scanner.nextInt();}System.out.println("第" + i + "班级的平均成绩:" + sum / 4.0);}}
}
正方形
直角三角形
public class Demo02 {public static void main(String[] args) {int number = 3;for (int i=1; i<=number; i++) {for (int j=1; j<=number; j++) {System.out.print("*");}System.out.println();}}
}
倒直角三角形
public class Demo03 {public static void main(String[] args) {int number = 5;for (int i=1; i<=number; i++) {for (int j=1; j<=number-i+1; j++) {System.out.print("*");}System.out.println();}}
}
等腰三角形
public class Demo04 {public static void main(String[] args) {int number = 5;for (int i=1; i<=number; i++) {for (int j=1; j<=number-i; j++) {System.out.print(" ");}for (int j=1; j<=2*i-1; j++) {System.out.print("*");}System.out.println();}}
}
九九乘法表
public static void main(Stringl] args) {
for (int 1=1;1c=9;i++) {for (int j=1; j<=1; i++){System.out.print(j+"*"+i+"="+i*j+"\t");}System.out.println(); }
}
冒泡
public class Demo10 {public static void main(String[] args) {int[] arr = {10,8,4,5,2,-1,56,33};for (int i=0; i<arr.length-1; i++) {for (int j=0; i<arr.length-1-i; j++) {if (arr[j] > arr[j+1]) {int temp = arr[i];arr[i] = arr[i+1];arr[i+1] = temp;}}}System.out.printin(Arrays.toString(arr));}
}
二维数组
public class Demo11 {public static void main(string[] args) {int[][] arr = {{10,8,4,5,2,-1,56,33,1},{110,18,14,15,12,-11, 156,133,11},{1110,118,114,115,112,-111,1156,1133,113}};for (int i=0; i<arr.length; i++) { for (int i=0; j<arr[il.length; j++) { System.out.print(arr[i][j] + "\t");}System.out.printin(); }}
}